Indicator.



No. 776.297 PATENTED NOV. 29, 1904.

v F. J. B. GORDEIRO.

INDICATOR.

APPLICATION FILED MAR. 31. 1904.

NO MODEL.

WITNESSES: INVENTO/f We EwcierekifJfiKZzfieiro llnirn TATES PatentedNovember 29, 1904.

lNDlCATOR.

SPECIFICATION forming part of Letters Patent No. 776,297, dated November29, 1904.

Application filed March 31,1904:- Serial No. 200,9'78- (N0 model.)

To all whom, it may concern:

Be it known that I, FREDERICK JOA UIN BARBOSA Coannmo, of the UnitedStates Navy, a citizen of the United States, and a resident of the cityof New York, borough of Brooklyn, in the county of Kings and State ofNew York, have invented a new and Improved Indicator, of which thefollowing is a full, clear, and exact description.

My invention relates to devices for indicating the time at differentpoints upon the earths surface, and has for its principal object theprovision of such a device from which the desired information may bereadily obtained without special computation.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a horizontal section above the base member of one embodimentof my invention upon the line 1 1 of Fig. 3. Fig. 2 is a top plan viewwith the indicating member in place upon the base, and Fig. 3 is atransverse section upon the line 3 3 of Fig. 2.

A designates a base, which may be of cardboard or any other suitablematerial and which, as here shown, is square in form. Upon this base areinscribed points upon the earths surface, in the present instanceconsisting of degrees of longitude, indicated by the radii B of a circleB and separated by intervals of fifteen degrees. WVithin this circle, atthe termination of the radii C of a concentric circle 0, are alsopreferably printed such geographical designations as the names ofcities, these being placed with regard to their longitude. Upon the baseis marked a definite area D, conveniently of a different color from theremainder of the surface and in the form of a logarithmic spiral-thatis, a spiral in which the radii increase regularly with the angle. Themajor axis of this spiral lies in the diameter corresponding to theprime or Greenwich and one-hundred-and-eighty degree meridian and itscenter coinciding with the common center of the circles. Upon this baseA is supported a relatively movable indicating member E, which may alsobe of cardboard and, as illustrated, is rotatable about a stud F at thecenter of the circles B and G.

being at the longest radius, and upon opposite sides of this axis theletters A. M. and P. M. are inscribed,indicating that the hours areantemeridian and postmeridian, respectively.

If desired, to more readily distinguish these opposite sections upontheindicating member they may be tinted in different colors.

Suppose that in the use of my improved indicator for the hour of four p.m. at New York it is desired to learn the time at other cities. Thegraduation upon the indicating member corresponding to four oclock inthe afternoon is turned to coincide with the graduation marked New Yorkor the radius indicating the longitude of that place. This being done,it is only necessary to read from the indicating member the hour orfraction thereof coming opposite the city the time of which is desired.It will be noted that in this position, which is substantially thatillustrated in'Fig. 2, a portion of the area D will appear between themidnight-line of the indicating member and theone-hundredand-eighty-degree meridian-line. All times for cities comingopposite this area will be a day ahead of the place from which the timeis calculated, while all others will fall upon the date prcvious. henthe area D is entirely covered by the indicating member, the date is thesame all over the world.

It will be seen that this indicator may be set instantly and the timesread therefrom without further difficulty. This graphic showing makes itof great utility for educational purposes to clearly illustrate therelation of time and longitude and also to business houses ,to regulatesuch transactions as the sending of cablegrams.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination with a base having upon it aseries of graduations representing points upon the earths surface andhaving a definite area marked thereon, of an indicating member similarin form to said area movable upon the base, and graduated in units oftime.

2. The combination with a base having upon it a series of graduationsrepresenting points upon the earths surface, of an indicating memberhaving the form of a convolution of a spiral, and graduated in units oftime.

3. The combination with a base having upon it a series of graduationsrepresenting points upon the earths surface, of an indicating memberhaving the form of one convolution of a logarithmic spiral and graduatedin units of time.

4. The combination With a base having upon it a series of graduationsarranged upon the radii of a circle and representing points upon theearths surface and provided With an area in the form of a convolution ofa spiral With its center coinciding with the center of the circle, of anindicating member possessing the same outline as the base area,rotatable about its center and graduated in units of time.

5. The combination With abase having upon it a series of graduationsarranged upon the radii of a circle and representing points upon theearths surface and provided with an area in the form of a convolution ofa spiral with its center coinciding With the center of the circle, of anindicating member possessing the same outline as the base area,rotatable about its center and graduated in units of time, the divisionsfor post and ante meridian hours lying upon opposite sides of the majoraxis of the spiral.

6. The combination With a base graduated in degrees of longitudearranged upon the radii of the circle and representing points upon theearths surface and provided With an area in the form of a convolution ofthe spiral With its major axis lying in the prime meridian and itscenter coinciding with the center of the circle, of an indicating memberpossessing the same outline as the base area rotatable about its centerand graduated in units of time.

In testimony whereof I have signed my name to this specification in thepresence of tWo subscribing Witnesses.

FREDERICK JOAQUIN BARBOSA CORDEIRO. lVitnesses:

JULIUS GALuANN,

A. O. BUsHEnDY.

